It happens to the best of us. You notice your air conditioner unit not cooling too well, so you take a look outside and find that there’s ice built up on the freon lines of your outdoor AC unit. This is not the time to panic, because we are going to give you some tips to determine if it is something you can handle on your own or if you need to call an HVAC professional.
What to Do When Your Air Conditioner Freezes Up
On your thermostat, turn the “Heat/Cool/Off” button to “OFF” and the FAN “Auto/On” button to “ON”. This will get air moving over your frozen coil without the AC running and the ice will begin to melt. This is important because the system needs to be free of ice for us to make a thorough diagnosis.
Air conditioning units require a certain volume of airflow to pass over the coil for proper operation. A dirty air filter can restrict the air flow and the unit will freeze up as a result. If the filter is dirty, remove and replace it. Let the system thaw out and turn it back on. If it freezes again, check the next step
Dirty outdoor coils can limit air flow needed to cool the refrigerant leaving the compressor. Disconnect the power to the unit and run a water hose over the coils to remove any dirt or debris. Run the water until it comes through the coil clear.
If either fan (indoor or outdoor) isn’t running, the the system will freeze. Turn the cooling back on and look for the fan motor running outside. Also put your hand by the vents inside the house to check for airflow there. A motor diagnosis and repair is something best handled by an HVAC professional
So there are some tips to mitigate your air conditioner concerns in the event of a freeze up. If these tips don’t solve your issue, then it’s time to call your local air conditioning repair company to make an evaluation.